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I only know this because I'm an architecture student, but pulling the door wouldn't have gotten him very far. Fire code requires that all exit doors in assembly rooms (100+ people) swing outwards and have crash bars on them in case people panic. Fire code also states that no exit doors can be locked from the inside, but I could see a professor or TA being a jerk and doing that.

But seriously, who leaves class early? I can see getting there late, but you kind of single yourself out for ridicule when you leave early.